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From The Collaborative International Dictionary of English v.0.48:
Concussion \Con*cus"sion\, n. [L. concussio, fr. concutere, concussum, to shake violenty; con- + quatere to shake. See Cashier, Quash.] 1. A shaking or agitation; a shock; caused by the collision of two bodies. [1913 Webster] It is believed that great ringing of bells, in populous cities, hath dissipated pestilent air; which may be from the concussion of the air. --Bacon. [1913 Webster] 2. (Med.) A condition of lowered functional activity, without visible structural change, produced in an organ by a shock, as by fall or blow; as, a concussion of the brain. [1913 Webster] 3. (Civil Law) The unlawful forcing of another by threats of violence to yield up something of value. [1913 Webster] Then concussion, rapine, pilleries, Their catalogue of accusations fill. --Daniel. [1913 Webster] Concussion fuse (Mil.), one that is ignited by the concussion of the shell when it strikes. Syn: See Shock. [1913 Webster]